D-Link DI-804 User Manual page 26

Click on the box next to Enable Open Ports to enable the use of the
index that you are using. You can enter a comment in the Comment field to
help recognize this index. Only one computer on your LAN can use each
Index. You can choose which computer you want to use by entering the IP
Address of that computer in the Local Computer field or click the Choose
PC button and click on the IP Address.
To configure certain ports to be opened, you must configure the
Protocol, Start Port and End Port fields. The Protocol drop down box
enables you to choose TCP, UDP, or –. – means that the router will not care if
it is TCP or UDP. It will lose efficacy protocol. Then enter a starting port
number and an ending port number in the Start Port and End Port fields.
Click the OK button to save your settings. Click the Clear button to clear
your changes. Or you can click the Cancel button to cancel your changes.
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